<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            text-align: center;
            margin-top: 250px;
        }
        #clock{
            border:1px solid #ccc;
        }
    </style>
</head>
<body>
       <div>
           <canvas id="clock" width="600px" height="600px"></canvas>
       </div>
       <script type="text/javascript" src="canvas.js"></script>
</body>
</html>